Hey guys,

My Cummins has been a good truck for me.
I recently had my tranny overhauled (wasn't dead, just tired).

Truck has been running 100% until last night, when at WOT (from a standstill) by third gear I suddenly lost all boost. Otherwise engine runs good.

I haven't spent much time troubleshooting it yet, but I get ZERO boost. I could not see any loose or cracked boots, nor any cracks in the plastic intercooler ends (did the soap test), but will look again tomorrow when I have some time and do a better soap test
It could be my turbo, as it seems like its not spooling at all.

I think the time has come for me to upgrade the turbo, intercooler and possibly injector tips.
I have 37" tires and can't afford to loose a lot of spool up time. I am not planning to race this truck, but I do want it to make reasonable power, be able to tow better, and control EGTs better.

Talking to a friend, he suggested the BD Super B Special, and possibly 100hp injector tips, and a Banks intercooler.

What do you guys think?

If I skipped the inejctors for now, and just went with the suber B Special and intercooler, will the truck be a lot slower to spool up? Slow spool up kinda sucks with 37" tires.

Any other possible turbo options?

I have the Smarty POD (set at 90hp or something like that), and do have the mp-8 but never use it.
Still rolling on stock lift pump...

Thanks

 

No way on what your friend suggested. It will be a laggy smokey pig with your tire size and rearend size. Couple of choices on intercoolers, HTT, Spearco, BD. Banks is just high. I would go with an HTT intercooler. I would recommend 50 hp injector tips and a HTT62/65/13ss or a Garrett BB turbo if you have the cash.

My biggest suggestion would be to take your time on the turbo. One little mistake and you will be buying another one due to improper sizing, etc.

 

Sure, that setup will work fine. As long as you add 4.56 gears to the mix.

Without changing gears all you will do is melt the engine down is a hurry.

If you want to retain your existing gears and still be able to control EGT's, 40-60 HP injector tips is the max and a set of twins.

 

Twins is always better, especially when big tire are in the mix. A single just can't provide the bottom end quick spool and top in go. The 3.73 gears with your tires are killing you.

 

Hey guys,

The truck with stock turbo and the 37s is OK.
Its not ideal, but it has been like this for 100,000 miles and its been a solid truck.

I could change the gears, but I'm not sure if that's something that would be worth while.

My other option would be to run another stock turbo, but I am assuming there is a better option.

I just don't know what the right choice is, and never really looked into effects of injector nozles on anything, other then more advertised hp.

Twins are expensive, and from what I have read, they don't spool any faster. But I would consider them.

What I am looking for is to make my truck work a bit better for daily driving/towing, and possibly make a bit more power if going through this change.

I guess that does not eliminate gear change. Back in 05 when I looked at gears, they were just starting to come out.

A set of 4.30s would work well IMO

 

Where did you read twins don't spool any faster? If you want cooling than twins are gonna be your best bet... If you think twins are expensive, wait till you melt the motor down... If I was gonna run a single turbo with your mods I'd say a Garret turbo would be good for you...

 

I did a search in this forum, and read a few threads where some people said that the twins don't spool any faster then stock necessary, just provide a lot of cooling and max boost. Also that you need way more aggressive fueling to make twins work.

If I was to go twins for towing and 37s, what's a good set, and what other support mods I need?

I looked into single because the stocker did ok. SO I thought I could upgrade to something a little better.

 

Your just not going to find a turbo that spools any faster than the stock HE351. Thats how it is designed but it suffers in the over all flow and DP areas.

A good spooling single is going to be limited in HP and cooling ability, thats the problem. Twins is really your only solution for a broad range of configurations and uses.

With the tall tires you need something that will spool like stock on the low end and still flow enough air to keep EGT's down. Without regearing you will always be fighting EGT's because the leverage is wrong and the engine is not making enough rpms and exhaust flow to spin the turbine(s).

 

Ok,

So if I were to go twins, what would you suggest?

Finally got some time to look at what went wrong with my truck.
It was the turbo. Taking off the air intake, I can see pcs of impler missing. It has some sloppy shaft endplay, but cold start the impeler still spins. No boost tho at all.

Soap test reviels nothing, so I think all the piping is good, I just took the turbo out. Hopefully nothing went through the motor, but motor sounds fine (for now).

SO I need to fix this truck.
I guess my options are:

- Get aftermarket lift pump (what's a good kit these days)?
- Get stock turbo rebuilt

OR

- upgrade turbo to twins and what else do I need for support mods? Injector tips?

IF I go twins, what's a good combo of turbo's for me to get. I want good spool up time, and big better then stock EGT capability.

Thanks

 

Doing some more reading, perhaps a Garret 3782 stage 1 or 2 (probably 2) turbo would be a good choice.

That or twins. Or twins with one of these turbos.

I don't want to spend a pile of money on the turbo setup right now. But I need to fix it and I don't want to put a stock turbo back in.

I don't know much about twins, what would be a good choice?
If picking turbos for a twin kit, how do you pick which turbo to get? Lets say a person was to run two of the Garret stage 1, or two stage 2 turbos in a twin kit, would that work or be missmactched?

Thanks guys, sorry for the ignorance.

 

A lot depends on what your trying to accomplish, big power or usability. A good effective twins setup uses the stock turbo as the primary and adds a larger one for better air. The down side is it is limited to around 550 HP.

Twins are expensive but they do get the job done so it is an option. You can call the builders of the Garrets Stage 2 and ask but I think it would make a decent primary turbo. You could add it now and upgrade later. The big question is the piping to get it to work becuase of its design. That would be a question for the builders.

 

I am gonna phone someone that sells garrets tomorrow and see what its worth for a stage 2 and talk about twins.

But twins might be a tad overbudget for me

 

Ordered stage 2 garret.